One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,8)(3,6,11,9)(4,7,13,16)(10,14,12,15)(17,18,22,23)(19,21,25,31)(20,24,29,32)(26,30,27,28)(33,34,38,36)(35,39,43,41)(37,44,45,40)(42,47,48,46)(1,2)(3,6)(4,7)(5,8)(9,11)(10,14)(12,15)(13,16)(17,19)(18,21)(20,27)(22,25)(23,31)(24,28)(26,29)(30,32)(33,35,38,43)(34,39,36,41)(37,42,45,48)(40,46,44,47)(18,23)(19,25)(24,32)(26,27)(34,36)(39,41)(40,44)(46,47) involution — undirected(1,2)(3,9)(4,7)(5,8)(6,11)(10,15)(12,14)(13,16)(17,19)(18,21)(20,27)(22,25)(23,31)(24,28)(26,29)(30,32)(33,36,38,34)(35,41,43,39)(37,44,45,40)(42,47,48,46)(1,3,5,11)(2,6,8,9)(4,12,13,10)(7,15,16,14)(17,20,22,29)(18,24,23,32)(19,26,25,27)(21,30,31,28)(33,35)(34,39)(36,41)(37,42)(38,43)(40,46)(44,47)(45,48)(1,4,5,13)(2,7,8,16)(3,10,11,12)(6,14,9,15)(17,21)(18,19)(20,28)(22,31)(23,25)(24,27)(26,32)(29,30)(33,37)(34,40)(35,42)(36,44)(38,45)(39,46)(41,47)(43,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.