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