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