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