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