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