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