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