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