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