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)(11,13)(12,14)(15,16)(17,18,23,24,22,27,21,28)(19,25,32,31,26,30,29,20)(1,3,4,8)(2,5,6,7)(9,10)(11,15)(12,14)(13,16)(18,24)(20,30)(21,23)(25,31)(27,28)(29,32)(2,6)(5,7)(9,11,12,16)(10,13,14,15)(17,19)(18,25)(20,28)(21,29)(22,26)(23,32)(24,31)(27,30)(3,8)(5,7)(11,16)(13,15)(17,20,23,25,22,31,21,30)(18,26,24,29,27,19,28,32)(10,14)(13,15)(18,27)(19,26)(24,28)(29,32) involution — undirectedA 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.