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