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