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