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