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