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