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