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