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