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