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