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