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