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