One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,7)(5,8)(9,11)(10,14)(12,15)(13,16)(17,18,23,25)(19,22,20,24)(21,26,30,32)(27,29,28,31)(33,34)(35,36)(37,40)(38,46)(39,41)(42,47)(43,48)(44,45)(1,2,5,8)(3,9,11,6)(4,7,13,16)(10,15,12,14)(17,19,23,20)(18,24,25,22)(21,28,30,27)(26,29,32,31)(33,35,39,37)(34,40,41,36)(38,43,47,45)(42,48,46,44)(18,25)(19,20)(26,32)(27,28)(34,41)(36,40)(42,46)(44,48) involution — undirected(1,2)(3,6)(4,7)(5,8)(9,11)(10,14)(12,15)(13,16)(17,20,23,19)(18,22,25,24)(21,28,30,27)(26,29,32,31)(33,36,39,40)(34,35,41,37)(38,44,47,48)(42,43,46,45)(1,3,5,11)(2,6,8,9)(4,12,13,10)(7,15,16,14)(17,21,23,30)(18,26,25,32)(19,27,20,28)(22,29,24,31)(33,37,39,35)(34,40,41,36)(38,43,47,45)(42,44,46,48)(1,4,5,13)(2,7,8,16)(3,10,11,12)(6,14,9,15)(17,22)(18,19)(20,25)(21,29)(23,24)(26,27)(28,32)(30,31)(33,38)(34,42)(35,43)(36,44)(37,45)(39,47)(40,48)(41,46)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.