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