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