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