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