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