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