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