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)(11,15)(12,14)(13,16)(17,18,21,25)(19,27,30,23)(20,24,33,38)(22,26,29,35)(28,39,41,34)(31,40,44,36)(32,37,43,46)(42,47,48,45)(9,11)(10,13)(12,16)(14,15)(19,28)(20,32)(22,29)(23,34)(24,37)(26,35)(27,39)(30,41)(31,44)(33,43)(36,40)(38,46) involution — undirected(2,5)(6,8)(10,14)(11,16)(17,19,29,41,21,30,22,28)(18,23,35,39,25,27,26,34)(20,31,43,48,33,44,32,42)(24,36,46,47,38,40,37,45)(10,14)(13,15)(19,30)(23,27)(28,41)(31,44)(34,39)(36,40)(42,48)(45,47) involution — undirected(1,3,4,7)(2,6,5,8)(17,20,29,43,21,33,22,32)(18,24,35,46,25,38,26,37)(19,31,41,48,30,44,28,42)(23,36,39,47,27,40,34,45)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.