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