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