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