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