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