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