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