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