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