One vertex per element, one color per generator, with an edge from x to x·s.
(5,6)(7,13)(8,12)(9,11)(10,15)(14,20)(16,18)(17,19)(21,22)(23,30)(24,28)(25,34)(26,29)(27,32)(31,35)(33,36) involution — undirected(1,2)(3,4)(5,7,9,15)(6,10,11,13)(8,16,17,14)(12,20,19,18)(21,22)(23,27)(24,34)(25,28)(26,29)(30,32)(31,36)(33,35)(2,4)(21,23,25,32,26,33,24,31)(22,27,28,30,29,35,34,36)(6,11)(10,13)(12,19)(18,20)(21,24,26,25)(22,28,29,34)(23,31,33,32)(27,30,35,36)(2,4)(5,8,9,17)(6,12,11,19)(7,14,15,16)(10,18,13,20)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.