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