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