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