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