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