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