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