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