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