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