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