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