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