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