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