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