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