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