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