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