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