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