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