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