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)(11,14,12,16)(17,18,23,24)(19,27,30,25)(20,22,26,21)(28,29,31,32)(1,3)(2,5)(4,8)(6,7)(9,11,13,12)(10,14,15,16)(17,19)(18,25)(20,29)(21,31)(22,28)(23,30)(24,27)(26,32)(9,12,13,11)(10,14,15,16)(17,20)(18,22)(19,28)(21,24)(23,26)(25,32)(27,29)(30,31)(2,6)(5,7)(17,21)(18,26)(19,28)(20,24)(22,23)(25,29)(27,32)(30,31) involution — undirected(3,8)(5,7)(17,22,23,21)(18,26,24,20)(19,29,30,32)(25,28,27,31)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.