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