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