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)(24,28)(25,26)(27,30)(31,36)(32,34)(33,35)(5,6,9,8)(7,10,12,11)(13,15,16,19)(14,17,18,20)(22,26)(23,30)(28,32)(31,33)(6,8)(10,11)(13,15)(14,17)(16,19)(18,20)(21,22)(23,27)(24,32)(25,26)(28,34)(29,30)(31,36)(33,35) involution — undirected(1,2)(3,4)(5,7,9,12)(6,10,8,11)(13,14)(15,17)(16,18)(19,20)(21,23,25,30)(22,27,26,29)(24,33,34,31)(28,36,32,35)(5,8,9,6)(7,10,12,11)(21,24)(22,28)(23,31)(25,34)(26,32)(27,35)(29,36)(30,33)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.