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