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