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