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