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