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)(21,22,25,29)(23,30,33,36)(24,28,26,35)(27,32,31,34)(1,2)(3,4)(5,7,9,15)(6,10,11,13)(8,16,17,14)(12,20,19,18)(21,22)(23,27)(24,35)(25,29)(26,28)(30,34)(31,33)(32,36)(2,4)(21,23,26,34,25,33,24,32)(22,27,28,30,29,31,35,36)(6,11)(10,13)(12,19)(18,20)(21,22)(23,31)(24,35)(25,29)(26,28)(27,33)(30,32)(34,36) involution — undirected(2,4)(5,8,9,17)(6,12,11,19)(7,14,15,16)(10,18,13,20)(21,24,25,26)(22,28,29,35)(23,32,33,34)(27,30,31,36)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.