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