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