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