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