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