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