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