One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6)(7,15)(8,12)(9,14)(10,13)(11,17)(16,20)(18,19)(23,29)(25,33)(31,35)(32,34) involution — undirected(5,7,10,17)(6,11,13,15)(8,16,9,18)(12,19,14,20)(21,22,26,30)(23,31,29,35)(24,28,27,36)(25,34,33,32)(2,4)(5,8,10,9)(6,12,13,14)(7,16,17,18)(11,19,15,20)(21,23,26,29)(22,25,30,33)(24,32,27,34)(28,35,36,31)(6,13)(11,15)(12,14)(19,20)(21,24,26,27)(22,28,30,36)(23,32,29,34)(25,35,33,31)(5,9,10,8)(6,14,13,12)(7,16,17,18)(11,19,15,20)(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.