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