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