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