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