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