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