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