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