One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,6)(3,8,4,7)(10,12)(14,16)(20,28)(24,31)(27,32)(29,30)(2,6)(7,8)(11,15)(14,16)(17,18)(19,23)(20,24)(21,25)(22,26)(27,30)(28,31)(29,32) involution — undirected(1,3,5,4)(2,7,6,8)(9,10,13,12)(11,14,15,16)(17,19)(18,21)(20,27)(22,25)(23,26)(24,29)(28,32)(30,31)(1,2)(3,7)(4,8)(5,6)(9,11,13,15)(10,14,12,16)(17,19)(18,23)(20,27)(21,26)(22,25)(24,30)(28,32)(29,31)(9,12,13,10)(11,16,15,14)(17,20,22,28)(18,24,26,31)(19,27,25,32)(21,29,23,30)(1,4,5,3)(2,7,6,8)(17,21,22,23)(18,25,26,19)(20,29,28,30)(24,32,31,27)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.