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